Gauge Control Module Input Test
NOTE:
Before testing, do the gauge control module self-diagnostic function, and make sure the B-CAN communication lines are OK.
If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.
Before testing, make sure the No. B29 fuse is OK.
Before testing, make sure the No. C34 fuse is OK.

1.
Turn the vehicle to the OFF (LOCK) mode.

2.
Disconnect the gauge control module 32P connector.
3.
Inspect the connector and socket terminals to be sure they are all making good contact:
If the terminals are bent, loose, or corroded, repair them as necessary, and recheck the system.
If the terminals are OK, go to step 4.

4.
With the connector still disconnected, do the following input tests:
If any test indicates a problem, find and correct the cause, then recheck the system.
If all the input tests prove OK, go to step 5.

Cavity
Wire
Test condition
Test: Desired result
Possible cause if desired result
is not obtained
3*1*2
31*1*3
GRN
Combination light switch ON
Connect to ground with a jumper wire:
The dashlights should come on full bright.
Faulty switches light
An open or high resistance in the wire
5*1*2
32*1*3
RED
Combination light switch ON
Connect to ground with a jumper wire:
The dashlights should come on full bright.
Faulty switches light
An open or high resistance in the wire
*1: With dashlights brightness controller
*2: Without multi-information display
*3: With multi-information display

5.
Reconnect the connector, and do the following input tests:
If any test indicates a problem, find and correct the cause, then recheck the system.
If all the input tests prove OK, replace the gauge control module.

Cavity
Wire
Test condition
Test: Desired result
Possible cause if desired result
is not obtained
16
RED
Under all conditions
Measure the voltage to ground:
There should be battery voltage.
Blown No. B29 fuse
Faulty under-dash fuse/relay box
An open or high resistance in the wire
15
LT GRN
Vehicle ON mode
Measure the voltage to ground:
There should be battery voltage.
Blown No. C34 fuse
An open or high resistance in the wire
1*4
BLK
In all power modes
Measure the voltage to ground:
There should be less than 0.2 V.
Poor ground (G401)
An open or high resistance in the ground wire
17
BLK
In all power modes
Measure the voltage to ground:
There should be less than 0.2 V.
Poor ground (G401)
An open or high resistance in the ground wire
6
LT BLU
Vehicle ON mode, brake fluid is at full level in the reservoir
Measure the voltage to ground:
There should be battery voltage.
Faulty brake fluid level switch
A short to ground in the wire
Vehicle ON mode, brake fluid is at lower level in the reservoir
Measure the voltage to ground:
There should be less than 0.2 V.
Faulty brake fluid level switch
Poor ground (G302) or an open in the ground wire
An open or high resistance in the wire
4
BLU
Vehicle ON mode, parking brake lever pulled
Measure the voltage to ground:
There should be less than 0.2 V.
Faulty parking brake switch
Faulty parking brake switch ground
An open or high resistance in the wire
Vehicle ON mode, parking brake lever released
Measure the voltage to ground:
There should be battery voltage.
Faulty parking brake switch
A short to ground in the wire
26*1*5
27*2*5
LT BLU
Vehicle ON mode, ECON switch ON
Measure the voltage to ground:
There should be less than 0.2 V.
Faulty ECON switch
Poor ground (G401) or an open in the ground wire
An open or high resistance in the wire
Vehicle ON mode, ECON switch OFF
Measure the voltage to ground:
There should be battery voltage.
Faulty ECON switch
A short to ground in the wire
7*3
YEL
Vehicle ON mode, washer fluid is half or more in the washer reservoir
Measure the voltage to ground:
There should be battery voltage.
Faulty washer fluid level switch
A short to ground in the wire
Vehicle ON mode, washer fluid is empty in the washer reservoir
Measure the voltage to ground:
There should be less than 0.2 V.
Faulty washer fluid level switch
Poor ground (G202) or an open in the ground wire
An open or high resistance in the wire
*1: Without multi-information display
*2: With multi-information display
*3: Canada models
*4: With dashlights brightness controller
*5: With ECON switch